How to Change the Coolant in a 2019 Sherco 250 SEF FACTORY

Shop parts for a 2019 Sherco 250 SEF FACTORY Dirt Bike.

Changing the coolant in your 2019 Sherco 250 SEF FACTORY is an essential maintenance task that ensures optimal engine temperature control and longevity. This guide provides step-by-step, model-specific instructions for a safe and thorough coolant change, along with insider tips specific to the Sherco 250 SEF FACTORY's unique cooling system.

What You Need

  • New coolant (preferably Minerva Perma Universal D 4 -25°C or another high-quality motorcycle coolant approved for aluminum cooling systems)
  • Drain pan
  • Socket wrench and appropriate sockets
  • Torque wrench (recommended for precision)
  • New gasket for bleed screw (recommended)
  • Shop towels or rags
  • Safety gloves and eye protection

Preparation

  • Ensure the bike is completely cool before starting. Never remove the radiator cap on a hot engine.
  • Stabilize the bike in a vertical position on a level surface–this ensures a complete drain and correct refill.

Draining Old Coolant

  • Place a drain pan beneath the lowest point of the cooling system (typically under the water pump).
  • Remove the radiator cap to allow air in, which lets coolant flow out more easily.
  • Locate the coolant drain screw (usually marked as [A] in manuals, on the lower part of the water pump or right engine side).
  • Remove the drain screw and let all coolant flow into the pan.
  • Once drained, inspect the coolant for contamination (muddy, rusty, or oily color requires further inspection for leaks in the water pump or head gaskets).
  • Dispose of old coolant responsibly at an approved collection center–used coolant is toxic and harmful to the environment.

Refilling and Bleeding the System

  • Locate the bleed screw on the left side of the radiator. Removing this allows air to escape during refilling, which is crucial for preventing air pockets (an issue that can cause overheating or engine damage).
  • Slowly pour new coolant into the radiator through the filler neck.
  • Continue pouring until coolant flows steadily from the bleed screw opening (no bubbles)–air in the system is being purged.
  • Replace the bleed screw using a new gasket (M6x8, torque to 8Nm if using a torque wrench).
  • Continue topping up until the coolant reaches the LEVEL mark in the expansion bottle or the top of the radiator fill neck, typically 1.1 liters for this model.
  • Reinstall the radiator cap.

After the Fill: Double Check

  • Start the engine and let it idle with the radiator cap on. Watch for leaks and allow the thermostat to open, cycling the new coolant.
  • Shut off the engine, let it cool, and check the coolant level again. Refill if needed.
  • Inspect around the water pump, bleed screw, and hoses for leaks.

Key Considerations for Sherco 250 SEF FACTORY Owners

  • Only use manufacturer-approved coolant. Using water or incompatible fluids can cause electrodeposition and severe engine damage.
  • The water pump and its gasket are known stress points–if you notice leaks, inspect the pump immediately and replace the seal or gasket as needed, following the factory torques.
  • Pay close attention to air purging; trapped air can result in hot spots and reduced cooling efficiency specific to the compact engine layout of the 250 SEF FACTORY.
  • Always check the radiator and expansion bottle levels regularly, especially after hard riding or any signs of overheating.

Pro Tips

  • Tighten the coolant drain plug to 6Nm, and the water pump housing screws to 10Nm if you remove the pump for inspection or seal replacement.
  • If the coolant frequently drops or you see consistent bubbles, check the weep hole on the bottom of the water pump for leaks–this indicates a failing seal.
  • The Sherco cooling system requires a full bleed anytime it is opened. Carefully follow the bleeding instructions above for the best results and engine life.

Following these precise steps ensures your bike's cooling system continues to deliver peak performance–vital for the 250 SEF FACTORY's high-revving, race-focused engine architecture. Stay ahead on maintenance and enjoy your ride with confidence.

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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.